fix(#7044): toWei trim strings with more than 20 decimal places

[gordon-to]

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[gordon-to]

fixes #7044

[jdevcs]

@gordon-to thanks for PR,

due to this change , there are build errors:

Error: web3-utils: src/converters.ts(580,10): error TS2454: Variable 'parsedNumber' is used before being assigned.
Error: web3-utils: src/converters.ts(580,92): error TS24[54](https://github.com/web3/web3.js/actions/runs/9125740835/job/25095746688?pr=7045#step:6:55): Variable 'parsedNumber' is used before being assigned.

[luu-alex]

hey there, the PR is failing some of the testcases, in the web3.js/packages/web3-utils run yarn test:unit to see tests

[luu-alex]

I added more tests and also added a fix for the function fromWei. Someone on the team will review this PR
Thanks for your contribution :)